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Hello!
When talking about a computer, is it better to say:
"it's hooked up to many information data banks"
OR:
"it's hooked onto many etc..."?
Thank you
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As far as I know, it's the first one.

That's what i would use.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Me too.
I have also heard 'hooked-in to', but I think it's less common.
True, I've heard that too, but as you said, it's not as common.